Automotive Honda EU generator -- which is the best oil temperature range rating?

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For the Honda EU 10i generator, the recommended oil temperature range suggests using 10W-30 oil, which is suitable for the current weather conditions. Some participants advise considering a 10W-40 oil in the future, especially since temperatures may approach the upper limits of the 10W-30 range. It is emphasized that following the manufacturer's manual is important for optimal performance and longevity of the generator. The discussion highlights the importance of selecting the right oil grade to ensure the generator's reliability. Proper oil selection is crucial for extending the life of the generator.
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Please below attached which is best oil in my 4 stroke gen set Honda EU 10i, weather temperature attached in my area. I all so have two oil grades > 4T 10w-30 and Coastal Synthetic Blend 5W-30, please advice which will help the life of the gen set
 

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Why not follow the recommended guidance in the manual? Seems like 10W-30 is what you need.
 
It looks like the 10W30 should be a good choice, though you might want a 10W40 in the future since you're near the upper end of the temperature range for the 10W30.
 
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